Other than a missed field goal in the Texas game, I wouldn't say that special teams have directly cost them a game. And that's one of just two misses for Hawkins all season. That loss is way more on the o/d collapsing in the 4th quarter than on 1 missed kick. Place kicking has generally been fine. Kickoffs have been fine. Very few kick off returns so kick coverage hasn't been an issue.
But kick returns are nothing. Punt returns are nothing other than penalties. Punting has been consistently awful -- they can't pin the oppenent inside the 10 to save their lives. Punt coverage hasn't been special and they gave up a long one last week against USC on a terrible punt. And then of course they got torched on the fake punt by Oregon on Saturday.
3 really bad plays (miss against UT, punt return by USC, fake punt by Oregon) but plenty of plays that aren't game-changers but are still bad. Poor decisions by kick returners. Punts from the 45 that should be inside the 5 or 10 being caught at the 20, formation penalties, holding penalties on returns. Just consistently giving away 10-20 yards of field position on every punt/return.
And they've had no game changing plays for the good. I think there's been one decent punt return all season?
Place-kicking has been pretty good is the absolute best I can say for OSU special teams. Nothing else will be positive.